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5mm @wat `tita- EDWARD W. BRET'IELL, OF ELIZABETH, NEW JERSEY. Lette/rs Patent No. 89,197, dated April 20, 1869; antedated Apr/ll 9, 1869.

IMPRVEMENT IN Doon-LATCHES.

The Schedule referred to in these Letters Patent and making part of the m.

To all whom it lma/ l/ concern Be it known that I, EDWARD W. BRETTELL, of the city of Elizabeth, in the county of Union, and State of New Jersey, have made certain Improvements in the Construction of Door-Latches; and I do hereby declare the following to be a full and exact description of the same, reference being had herein to the drawings that accompany this specification. as part of the same.

'lhe nature of my improvement consists in the construction, arrangement, and combination of the interior parts of the latch or lock, as hereinafter specified and shown.

In the drawingsi 1 Figures l and 2 show the interior of the latch or Figure 3 is a top view.

Figure 4 is an end section, with the key withdrawn.

Figure 5 is the same, with the key in its position when moving the parts.

Figure 6 is a slide and catch for holding back the bolt, and for locking the catch in the usual way.

Figure 7 shows a loose shoe, by which the bolt is operated.

Figure 8 is the back catch; and

Figure 9 show edge and dat view of the three disks or followers that, being directly operated upon by the key, move the interior parts of the latch or lock.

The same letters refer to the same parts in each figure..

To the inside plate of the case z, a tube, y, is aixed,

'which has a slot, x, in its upper side, with three indentations, w, in one edge thereof, and a round key-hole in its end.

Aninterior tube, fv, witha corresponding slot, but no indentations, revolves freely in the tube J.

This tube is open at both ends, its inner end being fitted to the hub of the loose shoe u, the shank of the shoe fitting within the slot causing it to turn when the tube turns by the key, the shoe being held in place by the tube alone, the tube having no motion endwise, it

reaching from the key-hole to the front plate of thev case of the lock.

The three disks or followers t slide freely in the interior of e, guided by the projection s in the slot in the tube fu, and the slot in the exterior tube y.

Spiral springs are placed between the disks t, and one between the last disk and the shoe u.

The key'r is round from the shoulder that impinges against the edges of the key-hole, two-thirds of its length. K

At one-third, it has another shoulder, which prevents itfrom passing any further through the hole in disk t l.

At two-thirds is another shoulder. The remaining third of the length of the key being square, it can pass through t 2, which has a square hole to fit it.

Disk t 3 being solid, the end of the key pushes it before it, when it enters the lock.

It is seen in the section, iig. 4, that when the key is withdrawn the three disks are, by the spiral springs, pressed toward the key-hole.

The projections s are not then in a line with the in- 1 dentations w in the exterior tube y, and therefore the interior tube e cannot be turned.

In'g. 5,.it is seen that thekey, when entered, pushes the disk t l opposite indentation w l, t 2 opposite indentation w 2, and disk t 3 opposite indentation w 3, and the tube e can' be turned by the turn of the key, by the keys turning disk t 2, which fits the square part of the key.

The part q, in figs. 1 and 2, is cast fast to the case to receive the screw, which holds the back plate z in its place, and forms a guide to the shank o of the bolt, and also a stop for the loose shoe 'u and guide for the slide, iig. 6, p..

Upon the pin n, that is fast to the slide p, is placed the back catch m.

Upon the under side of mis afstud or block, l, between which stud and the pin n, on the slide p, ,the end of the shank o of the bolt is held and moved. The end of the shoe u, in turning, impinges against the slide p, carrying back with it the main bolt, the slide p, and the back catch m, which are all returned again to `their places by the spring k on the shank o.y

The spring j holds the catch min position, as shown by the drawing, also, when in the position shown by the dotted lines in figs. l and 2.

I do not claim broadly any slotted indented combined tubes, nor disks or springs; nor do I claim operating locks or latches by projections on the key, nor by a shoe turning on a stud or pin fast to the case of the lock.v

What I claim as my improvement, and desire to secure by Letters Patent of the United States, is

1. The centre disk t 2, when used to turn the tube c, in combination with the key 1', fitted thereto, substantially as shown and described.

2. The combination of the slide p, catch m, and springj, constructed and arranged inthe manner and for the purpose specied and shown.

Witnesses: E. W. BRETTELL.

W. M. GooDiNG, EDWARD GoLLvnR. 

